An 05 star has an H? line present in its spectra. What color is the line?
a. red
b. no color as the line is in the UV band
c. blue
d. no color as the line is in the infrared band
Answer: a. red
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Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age less than people who stay behind on Earth. B) age more than people who stay behind on Earth. C) have more fun than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.
You measure Cepheid variables in galaxy A and galaxy B. Both Cepheids have the same period, but the one in galaxy B appears 16 times brighter than the other. You conclude
A. Galaxy B is 16 × 16 = 256 times more distant that galaxy A. B. Galaxy A is 16 × 16 = 256 times more distant that galaxy B. C. Galaxy A is 4 times more distant than galaxy B. D. Galaxy B is 4 times more distant than galaxy A. E. Galaxy B is 16 times more distant than galaxy A.
Which of the three arrangements shown below will light the bulb?
If R = 3.0 k?, C = 6.0 nF, ?1 = 10.0 V, Q = 18 nC, ?2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb?Va?
A. ?13 V B. +28 V C. +13 V D. ?28 V E. +2.0 V